Hypopyon refers to a collection of white blood cells in the anterior chamber of the eye that can lead to inflammation and vision loss. Synonyms for hypopyon include pus in the eye, anterior uveitis, and endophthalmitis. Other related terms may include exudate, infiltrate, or abscess, all of which describe a similar buildup of fluid or cells. Hypopyon is commonly associated with infections, such as keratitis or corneal ulcers, but can also occur as a result of trauma or underlying medical conditions. Early diagnosis and treatment are essential for preventing further damage to the eye, including permanent vision loss.